Twelve people were killed and 15 injured on Sunday, in four separate accidents, three of which occurred in Homa Bay county.
In the first accident in the morning, a lorry driver lost control and crashed into a boda boda ferrying three passengers at Kadel trading center in Rachuonyo North subcounty.
The boda boda rider and two passengers died at the scene while the third victim was taken to Homa Bay County Teaching and Referral Hospital with injuries.
The lorry driver is said to have continued to Nyangweso trading centre where he rammed into a house killing a six-year-old boy.
The boy's mother and three siblings were injured and taken to the county hospital.
In the third incident, a mother and her three children died when a matatu headed from Oyugis to Kisumu collided with the boda boda they were travelling on. Boda boda rider Samson Owiti also died in the accident.
The mother and children were identified as 45 year-old Silpa Adhiambo and her children Michel Awuor (six), Ida Akinyi (nine) and Sivia Akinyi (12).
Witness William Oindi said the accident occurred while three matatus rushed to pick passengers.
"The motorcycle was on a dangerous part of the road. The driver of the first matatu did not alert the one behind him. The vehicle rammed into the motorcycle before landing on its side off the road," he said.
Homa Bay county commander John Omusanga said the matatu driver was arrested and taken to Oyugis police station.
"We have launched investigations so that legal measures are taken against those who bend traffic laws,” Omusanga said.
He said the bodies of those who died in Rachuonyo and that of the six year-old boy were taken to the the Homa Bay hospital mortuary.
The bodies of the victims of the third accident were taken to Rachuonyo subcounty hospital mortuary.
In the fourth accident which occurred in the evening, three people were killed and 10 injured when a matatu collided with a private car at Munami along Busia-Bungoma road.
Two people died at the scene and one upon arrival at St Mary's Hospital in Mumias, where those injured were taken.
St John Ambulance communications manager Fred Majiwa said those who died were a three year-old child and his parents.